Gree GDN12AJ-K4EBC1A Service Manual page 17

Service Manual
4. Compressor Can't Operate
Possible causes
Wrong wire connection, or poor
connection
Compressor relay on the
mainboard is broken or the
compressor needle stand is
loosened
Capacity of compressor is
damaged
Power voltage is a little low or
high
Coil of compressor is burnt out
Cylinder of compressor is blocked
5. Water Leakage
Possible causes
Drainage pipe hasn't been
installed correctly.
6. Abnormal Sounds and Vibration
Possible causes
There is abnormal sound in some
parts when just turning on or
turning off the unit
There is abnormal sound of
refrigerant flowing when just
turning on or turning off the unit
There is touching sound of foreign
objects or parts inside the unit
Abnormal shake of compressor
Abnormal sound inside the
compressor
Maintenance
Discriminating method (dehumidifier status)
Check the wiring status according to circuit
diagram
Check if the relay is sucked in cooling mode
After tuning on the unit, the unit can't dehumidify.
Use universal meter to measure the resistance
value of two contact points of capacitor. If the
resistance value is too big or o, the capacitor is
damaged.
After turning on the unit, dehumidifying effect is
poor or compressor is turned on or off frequently.
Use universal meter to measure the power supply
voltage directly
There is no dehumidifying effect after turning on
the unit; test the resistance of the wiring poles of
compressor with universal meter; if the resistance
is infinite or zero, it means it is broken
The dehumidifying effect is poor after turning on
the unit; the noise of compressor is big and the
compressor is hot
Discriminating method (dehumidifier status)
Water is coming out from indoors.
Discriminating method (dehumidifier status)
There's the sound of "PAPA"
Water-running sound can be heard
The unit gives out abnormal sound
Outdoor unit gives out abnormal sound
Abnormal sound inside the compressor
Troubleshooting
Connect wires according to wiring diagram to
make sure all wiring terminals are connected
firmly
Replace the mainboard with the same model
Replace the compressor
The fluctuation of voltage is 10% rated power.
If the power is too low or too high, you are
suggested to equip wit voltage regulator.
Repair or replace compressor
Repair or replace compressor
Troubleshooting
Eliminate the blocking objects inside the
drainage channel.
Troubleshooting
Normal phenomenon. Abnormal sound will
disappear after a few minutes.
Normal phenomenon. Abnormal sound will
disappear after a few minutes.
Take out the foreign objects; adjust the
position of each part inside the unit; tighten the
connection screws; apply some damping gum
on the touching parts
Adjust the support foot mat of compressor,
tighten the bolts
If add too much refrigerant during maintenance,
please reduce refrigerant properly. Replace
compressor for other circumstances.
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